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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5642566f2358262a989e9f2621986fb6b4d3bc5ec8c3244c93909222c06566d' 
  AND token = 's9LQqmRhhL6W/949MNWgI5SYMn30Z2BVWOtpQyXMi9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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