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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27dc34a88dcd177572b23c773081343753e2c62c286c7dfa59080321309089e' 
  AND token = 'LU3VOL47uDhtDa0Ny4n1lswkYCuZosTSgNRlj8H2vsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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