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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999ec5c62e8d3000f46d6a6de202bc15fee189f2868d2eb86867e75f5434a0b0' 
  AND token = 'h6I1Et63/+otKlRLC+mPEDhzgNsim53Of34GQfoYSdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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