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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbf3015a4fffd6f5535209abee80add3f4c8c2f2c562dfa550f6f9762bd1a7f' 
  AND token = 'svKAcU0KEC3QyYJswMwyJC1vVgxoJbUrB5UCb9OhV2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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