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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d142c0e5acd4328f2e8c59a2258a598c8bd0cc2c75c3a41fa50cccd229a1b7' 
  AND token = '4gczGx2EqRtKOhx68wsyPMJ33sCuxp/Q0v3dRt1SbZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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