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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4553d93d576dd301665d100b4483f239e7d00c3d95f5a60a45ee9121a82bf93' 
  AND token = 'LwsNC99erB0aJyXMrxgstowaELzUB9wy/jW9JQWwMyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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