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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c991b7bc8a4001cd6171dcef7975717199fdd8bcf574df8785c4f89e1f965f3d' 
  AND token = 'BajGTW4PYkKip6Unp29lycdE14AuhvOvr+ymocCXeDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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