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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f47f879fc935bd042a3f6ddeca3cd5146f9de09de5b2c0b9a1959b6f4477a2' 
  AND token = '8oFu0tzq0piopyEFQeN6q6mtlZjKuShVC4rkGgNWOUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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