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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba623fb63499d7740defc756585e05ef5144bcc81b76a00005b23fc26c5375da' 
  AND token = 'AyzgH7Xxo71hN3gC46WSnt+JzM6T136tz24qcgw6Kk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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