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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd830d2c1fcdfea820019ee801b21c7212dd19cc3e32b44aa75f8d3791a5640d0' 
  AND token = 'llR5HScSCNsGCXIM2YzcS2P87eU6S9m3ceYm+hLrZX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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