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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e5bfd96bc95edcd630bcdc76eaa06d06a9b6e776a0a9959ea14d8246abee0b' 
  AND token = 'Xpso+WJifLKliM/qqBOLwLZ8cm3AeywKWH1v5Vp/uPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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