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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3608fe447436e05558ec1495852e201ed36652c5d532e61557d82de3fa383d' 
  AND token = 'g1M+UmjQSyp2zUIUn5KZ0Gq1dymi48BJa2UbGYZvrKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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