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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3af5b7147e26780fceead941390b8567bc5e27a33f4f02469e2c4f50e2cb75' 
  AND token = 'In9OQ5gkLZ0U7rleZW/tqgcMhKVOdRIpFM6sbWOfLJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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