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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9921d4568f0d704503479cef39d113aaf234959d74070ad0b251d8b10d5da0' 
  AND token = 'dOsCM0B6ymeiZ5F8xTOK4P3wrsQEHal1B54zvp0qaPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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