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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b470a979a6046c3810918fce0eb0e9ad6292e3c0cbedab1d050011a1f4cfb009' 
  AND token = 'BAx2UZSnalfJqqpf8yXP22hMqZ2N13QW+/5w4ECV+oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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