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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205e393bff6ad1d594e93d0d72d5597ced6ebd587edfa1ccffd3c30fedca7617' 
  AND token = 'CZFuBW3Yjj4iqoLFuv5YdQaNfDp0p48AORJPCIt0grI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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