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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaf2738281b8ad862267c780fbf7f5e5afae6085a35d67e66496af57c277dd1' 
  AND token = 'VnAccv32J2P9e2o9unFO8qazaaXtqw+jMDVsVsIqSjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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