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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5a1368441de7a7b93dd6d58d0ccd3ad248f098252e71ea3e149d58876b1871' 
  AND token = 'SPXb15Flvvy0qRKEVPtpRxcbFt6hCvIMCckeSEX6QEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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