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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806cb12e4caad6c54f9a0ca94558b9c59f01e568b427fae3977f0c86ccee9e6e' 
  AND token = 'N7kb2JEO9C3213xQDi6H6kiausAG/Vf6sxTTSfL3ovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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