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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62fd8b2a8607cd9c45271207f449544c2d3f6236ed206d7800f63a1b0d53613' 
  AND token = 'J8WudnWXl1v5iJa9YHA5GqX3++QbYq6WOhWklHOwE8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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