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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfe7cef55fb76feffee3ab3408444c91a81374f202567e1c0b6cc7e391a5ab8' 
  AND token = 'Oj8veNoXLC8Q1XXnOrPqidLSBJacWXynELB1G+hSe3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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