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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0a5cedc417dcc635abcc0fad7035f22f632cd770ab73f2c2c1a933ef27b0ce' 
  AND token = '4r7PT3OdWWGpjp1WcEqkA7f1RQOPOID4oyobddN0R94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}