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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c2d72fa99ab0dba24a04aecd87bd23f870466f73d0bcb82396e042d626bfb8' 
  AND token = '2P1TfKlTtM73BeUsps09pP4rjsqp681Rnxxd6N4VxAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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