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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4764a3cbbda756df4bd33d92ab66eddf005d576b91c05d80f5455d73a735992e' 
  AND token = 'Ot3ewW7I28vQvI5vIHm/xDydlaIX2ldOn10I4HGKXmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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