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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eabed979e8e0690f87819a6c6562921a38780d310dc00504f95dbfb5d2fa9a' 
  AND token = 'so2v+pB9Jc/0LU1DNvRu5stblGrV76qd8zhl1tq4q6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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