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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f1db2de9e5fe3f68fd69998102ff69ee2134b89e64f869ff30f680252f8532' 
  AND token = '0Vu94wwCRIVze8a3kCYaGbrRclis4Kh3XWm8nNEOtg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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