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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92e1dc9f2f67b5f2b8a8dee055f060de0530bffa7a9d85b0d25c50f8aade7b9' 
  AND token = 'cvMgC9aVrYQptxZzWZL556yx+GlAcXpG3PA3f7fF08I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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