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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba259e6afd08d46f947973086b3d8459a5e7f258d18a28934c9564177be99b2' 
  AND token = '29GZcAcPj1efDNwfUorDgPFvuI6cf3ciksb99+4a4/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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