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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbf76da5ce7de605c00fb4301fb3031eba9a2f88d0e3fd3fad2ad22d0d8980d' 
  AND token = '/jPBn8dnZGEIXbnd4Mk22/0aLzIdomJoFtoaFHWK3eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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