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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a89e4bd7fc2b6e1c98f5b854f73cc46b6a7d4bf3b2b8aaac311d04642c66b0a' 
  AND token = 'aIj5bpQnj+Kiuyb5sBpvIJ13TzZm8aK/t5dfX95YuIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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