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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a199a2c73db9ea53a4c4eafae99b736da22ae186ed33c4b7d2bb93c47a9701fa' 
  AND token = '2ef9dUOjE0VeznAhuXA9XE+fLg7qNsV8e1+yD2SAEsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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