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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfb479b0301411c0b2b6ce8f7e9ca57604201816bca27d8a9c7a9e283468f5c' 
  AND token = 'v/q6Mcy6291KWcLKIH00hJ6UBo+PwBdUIDA3HsODdus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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