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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c14af836c58c27c6dd83fe9cc5320b8602420136dc1386ec6a863b4fababf7' 
  AND token = 'eCsY0ag6e/a1b8iapWfzx/mzHxoNAhffSKMfVY7P1/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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