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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8bdbcbd689abefb564f2c6acb2a69663d732c8fc5cbbd7bc4d7f5c1ff60499' 
  AND token = 'Tnb1KRMb8sb8+SofQC2+WBcQtoEbmwTl+mSiXGfsDCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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