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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0368500e9961d9f26575edd2583c7ae878542a5938e829c0d8772a0b1387d0e3' 
  AND token = '9k6kkVMRK74elvtFBKm9Ekejhc7m9T6LuwtpnOQj1b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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