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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e745b34e23cfe5d45f108c5e8a0f9ef8d902d0c343506d502719d88cac44b2c' 
  AND token = 'DHVQYxVa+7ZZsQqPAW1TGeMQDw8Yybn3TJ1oRGblK/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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