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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792f9de7bc479fc3af52c1797e31c3f2a65e0cadb4e1b5e94da50d137d8fad04' 
  AND token = 'ziqqf4IJv+wrQQedv64swbp1Q63nZ2AwEtFX+ujwjDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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