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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b437a9087cf7779c6b83b9d01893f43cd278f06a6e36c8f425f7bc40a19f870' 
  AND token = '5jJ3H9u8K08Hr4jInE3Y1+4FYVgiJuxonyKOiUb/fJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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