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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bafaf3d8fff09a2f2aff153df32744d85b9320174b27fb41f56b1f9f074b6c4' 
  AND token = 'k5uLTfanOOWtmZ2WDbRMuRZU7INUpmdNj6y1lcU9If0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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