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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca2c06721e13c974e89d718ee5bcd90e34f1bee4e7260afb5d3a18756b56f4b' 
  AND token = 'Oj6YjIfzwotheLTd9yU6o0/Y3vL6e7etZnuf3w2ijvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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