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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2dcff8107d0d3fe8bd1450abbb2192c332b587bdd9697fcfb5508c5d1bff40' 
  AND token = 'NL7SpUtpqRnhVwcJGnxa1mW6/tmu81G/hzvDX1o7Wi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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