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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e907410ead9707aa941ea949119994111bc6ca6b978a6d83f9314fb054cee0ff' 
  AND token = 'zpGJhCak2/qCDfi8AmKpzH+V1zgP2QEFbGVfXA8zvcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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