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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e3592e29f2f82ee5c6cdc8f23e3bcca366f4ddcec78ae9344251ccddf14a6a' 
  AND token = 'vhpMRMZUv3g4FtYdqo1rCdb9F+m1fLAgBgDUoAeFa/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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