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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a3f5bd9118ac207811a9132a38d77b91438716e4852fe24ccb29204ba174ab' 
  AND token = 'CGcxWmExhiw7/RZHnX1SL4thl5R/sexD4V5jM49zNgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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