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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cf1795707632de9b91c89d0a5299e79bd47c737eba14acc12a3c549c7910be' 
  AND token = 'tyIAEfXI9lZOt9BBrXSYEcL/hisKKnCMuGlUrydiBGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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