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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81d3b393ae86fd4ead9e6c12f3127b9908b2492af749ec1f39b6d44b9ab1d71' 
  AND token = 'aT8zoaCUTXJk5vgs7X/laglwf2LWNnhsyoU77xQcJjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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