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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abffc1986dc764f493cffe7a64e8d33f8ee1ca5920e36732ddaf870703f9adc' 
  AND token = 'e3NAYEW643u6TtL8k/feSbEOCw8FOUGmy8dnxxDPJ9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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